2015 scrambler 850, have posted before but hoping for some new answers. Bought it, put a few hundred miles on it, no issues. did wheel bearings and bushings with some other maintenace, including all fluids. all good for 100 miles after approximately. (rode a whole weekend at tall pines atv park) came home, cleaned it all up, went for a ride and after about 45 mins of riding, suddenly, started overheating. let it cool, took off again, overheat again. towed home. now, what i have checked: coolant was full to the top from the time it first overheated. ive had the water pump cover off twice. tried all new hoses. tried a friends rad/fan. tried same friends ect sensor. coolant does circulate. noticed header glows red after only 5 mins of runnning or less. possibilities in my opinion... fuel pump, down to about 52 psi from 58 spec, plugged exhaust, dirty oil (wouldnt think so with 100 miles on it, but possible)... open to ideas, ive been down for months already and basically had to walk away from it for a bit until now. local dealers no help.